[Evolution] Signature or Script at the Insertion Point

[Jonathan Ryshpan <jonrysh pacbell net>]

Evolution places the signature at the end of the email being composed.  Is there a way to have it placed at the insertion point, which is what I want when top posting?  More generally, is there a way to insert the output of a shell script at the insertion point, similar to what can be done ini vi?

--
All the best - jon

"On two occasions I have been asked [by members of
Parliament], 'Pray, Mr. Babbage, if you put into the
machine wrong figures, will the right answers come out?'
I am not able rightly to apprehend the kind of confusion
of ideas that could provoke such a question."